LTC3350

LTC3350 Features High Current Supercapacitor Backup Controller and System Monitor Description n High Efficiency Synchronous Step-Down CC/CV Charging of One to Four Series Supercapacitors n Step-Up Mode in Backup Provides Greater Utilization of Stored Energy in Supercapacitors n 14-Bit ADC for Monitoring System Voltages/Currents, Capacitance and ESR n Active Overvoltage Protection Shunts n Internal Active Balancers—No Balance Resistors n VIN: 4.5V to 35V, VCAP(n): Up to 5V per Capacitor, Charge/Backup Current: 10+A n Programmable Input Current Limit Prioritizes System Load Over Capacitor Charge Current n Dual Ideal Diode PowerPath™ Controller n All N-FET Charger Controller and PowerPath Controller n Compact 38-Lead 5mm × 7mm QFN Package Applications n High Current 12V Ride-Through UPS n Servers/Mass Storage/High Availability Systems The LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can run in reverse as a step-up converter to deliver power from the supercapacitor stack to the backup supply rail. Internal balancers eliminate the need for external balance resistors and each capacitor has a shunt regulator for overvoltage protection. The LTC3350 monitors system voltages, currents, stack capacitance and stack ESR which ...